Aerosol bomb valve



May 13, 1952 R. s. KNAPP 2,596,414

AEROSOL BOMB VALVE Filed sept. 1s, 194e /lllllllllllllllqmlvummw u 'sez'Mmm@ FIG.I

ROBERT S. KNAPP INVENTOR.

EY/gm ATT'YS Patented May 13, 1952 aERosoL BOMB VALVE Robert StephenKnapp, St. LouisMo., assignor, y mes'ne. assignments, to Knapp-MonarchCompany,lSt.Louis,.Mo.

Ware

a corporation of' Dela- Apnlicatien September 18, 19.46, Seria-1 Ncftili3 Claims.. (o1. esi- 78) My present invention relates to an aerosol bombor similar type of spraying device 'in which a container of liquid ischarged with gas from a CO2 bulb or the like and thereafterl the gasdisplaces the liquid through a discharge opening whenever a valve forthe 'opening lis" moved to open position. i

One object of the invention is to provide a valve of this generalcharacter :which eliminates the usual valve seat and valve plug,Vpetcoclr or other type of valve usually provided'forcontrolling the nowof liquid under pressure.

Another object is to provide anaerosol bomb which is readily renewableas to liquid' contents, and as to gas pressure for dispensing the'liquidcontents.

Still another' object is to provide an assembly of container, dischargevalve, and bulbholder and piercing unit, in whioh'the bulb holder servesconveniently as a handle for the aerosolbomb.

With these and other objects in' view, my invention consists in theconstruction, arrangement and combination of the various partsof defvice whereby the objects contemplated `arejattained, as hereinafter"more fully set ifntli,l pointed out in my claims and illustrated theaccompanying drawinga'wherein:

Figure l is a verticalsectional'view through an aerosol bomb embodyingmy invention.v

Figure 2 is an enlarged sectional view of the valve structure of thebomb showing the valve in open position as distinguished from the closedposition of Figure l, and

Figure 3 is a more greatly enlarged sectional View on the line 3-3 ofFigure2 showing .details of the valve.

On the accompanying drawing I have used the reference character I tolindicate a container, which container is provided with a bottom memberI 2 and, is adapted to contain liquid i4 such as insecticide or thelike. The container Hl has a threaded boss I 6 into which a head H isscrewed with a gasket I8 interposed between the head and the upper endof the boss.

The head has a boss 20 on which a bulb holder 22 is threaded forcontaining a bulb 24 of CO2 gas or air under highcompression. and for`propelling the bulb toward a hollow. .piercing pin 26 in a well knownmanner.` The piercinglLp/in 26 is carried by a flanged fitting 28located in a bore 30 of the head H and this bore is connected by apassageway 32 to the interior of the boss I6. A capillary tube 34extends from the tting 28 through the passageway 32 for discharging gasinto the boss I6 and into the container I0. A

Sealing sleeve 36 of rubber 0r, the likgis e911-` iaiaedinaii enlargedpart of the here 319i@ Seal against the ntfkef` th bulb ,24` during thepier@- iasoperatioa asrphori tube 38.112,5 its upper @nel `saure@ in the,head H and terminates .iii a bell Shaped@- ception fitting, 40a@ itslower, en@ The ttins 40 is loatd, in. a .Sums *4.2, @f thecontaiaerbettom I 2,. A capillary tube-"44 ef slightly less diameter thantheinternal diameter` o fv .the Syphcn ,tube 38 is `SlidablymQunted 'intb-ausw end of the syphun tubeand .isalso .Slidable through a plug 46screwed into the head H to Compress a gasket .48surr0und1ns the.capillary tube.

The upper end of the capillary tube passes through a `slidablepplug50Vand coniignedbe-L tween it and a slidablepushvbutton element 52.`

The elementsv 50. and `i2 z l wardly against a flanged closure,nlug541`by a spring 56 as shown in Figure V1 and maybe depressed as in Figure 2.by thumbpressurecn the push buttonelement 52.

The capillary tube 44 has a right angle bend at its upper end that'provides a discharge nozzle 58. The head H has a vertical slot 6U inwhich the discharge nozzle 58 may move from theupper position of'`Figure 1 tothe lower position of Figure.2 whereiniitr"`centeredrelativetoa de-`- pression `(i2 inthe front of l theV head TheCapillary tube `44 has an opening `Silfirl one side thereof and itsflower endis closed as indicated at 66.` lInithe :upperposition ofFigure l, the opening 64 ,isvabove the packing 48 vthus preventingiluidrlovv` from the'discharge nozzle 58. In the position of `Figure 2the lopening 64 is below the packing `Il!! thus 'permitting uidlowunderwthe pressure of. the'gas vintroduced from the bulbl24 into thecontainer l0. This arrange ment 'provides a verysimple valve and onewhich will give long life and trouble-free operation It will be notedthat theboss' I6 basa downs wardly extending endil whichprecludes llingthe container l0 above thelevel of liquid shown inFigure 1-` l e saryspace for introduction of gas: under pressure from the .bulb24. Thecapillarytube 34 :throttles the iiowoi gas so that `itisnt dischargedtoo violently intothe containerrlll after the ,bulb is pierced.

The slot 6U' in cooperation with the depression 62 in the front of thehead H protects the relatively small nozzle 58 from damage when theaerosol bomb is not in use. At that time the nozzle 58 is in the upperpart of the slot as shown in are, normally; held lip- ',Ihis is in,vorder-'to ,leave the neces-V- Figure 1 and by dot and dash lines inFigure 2. The upper part of the slot is wider than the length of theprojecting part of the nozzle to give the protection desired.

When the nozzle is lowered to the full line position of Figure 2 thenozzle projects from the surface of the depression 62 so that theportion of the head surrounding the nozzle does not interfere with theatomizing action produced by discharge of liquid under high pressurefrom a minute opening as represented by the internal diameter of thecapillary tube 44.

The external diameter of the capillary tube 44 is but slightly smallerthan the internal diameter of the syphon tube 38 as shown in Figure 3.In a valve of the size shown in Figure 1, for instance, the outerdiameter of the capillary tube 44 may be approximately .028 and theinternal diameter of the tube I8 about .006" to .008l larger. This willgive a space all around the capillary tube that is .003 to .004 wide.This results in a maximum area in the space between the two tubes ofapproximately .0008 which is only two twentyfifths of one percent of onesquare inch and this is the area that the pressure in the syphon tube 38exerts against the packing 48. This area being very small will produceonly approximately .12 lbs. per sq. in. pressure on the packing when thecontainer Il] is charged with gas at 150y pounds per square inch. Thepressure on the packing is accordingly substantially negligent.

From the foregoing specification it will be obvious that I have provideda simple type of refillable aerosol bomb which can be convenientlycharged with the required pressure for discharge of liquid in aerosolform by association of a compressed gas bulb with the bomb. It will benoted that the bulb holder 22 when associated with the head H and whenthe head is mounted on the container I8 projects in such a position withrelation to the container that it serves conveniently as a handle forsupporting the aerosol bomb and the push button 52 can be readilydepressed by the thumb of the hand holding the bomb.

After the desired spraying yoperation the push button is released andthe valve returns to closed position, the construction of the valvebeing such that there is positive closing against any leakage whatsoeverand the bomb can therefore be used intermittently with long periods `ofnon-use yet it is always ready to use when needed. At the same time whenthe bomb is emptied of liquid this fact is denoted by the discharge ofgas when the valve is opened and the bomb is made so that the head H canbe unscrewed from the container l0 to recharge the bomb with liquid. Theuser can then unscrew the holder 22, insert a fresh gas bulb 24 thereinand screw the holder back into position (about two or three threadsfarther to the right of the position shown in Figure 1) whereupon theneck of the bulb is pierced and the bomb is ready for use.

Some changes may be made in the construction and arrangement of theparts of my aerosol bomb without departing from the real spirit andpurpose of my invention, and it is my intention to cover by my claimsany modied forms `of structure or use of mechanical equivalents whichmay be reasonably included within their scope.

4 I claim as my invention: 1. In a valve structure of the characterdisclosed, a capillary tube, a head, a syphon tube carried by said headin which said capillary tube is slidably mounted, said syphon tubebeingV adapted to extend from within a container, packing means betweensaid syphon tube and said capillary tube, said capillary tube having aclosed inner end, an opening adapted to be selectively positionedoutside or inside said packing means and a curved outer end, means forsliding said capillary tube outwardly relative to said syphon tube withsaid lopening outside of said packing means, and a push button forsliding the capillary tube inwardly to a position with said openinginside said packing means by manual pressure, said head having a shallowcone-shaped depression provided with a slot in which said curved endtravels from an outer deep end of the slot to a shallow inner endthereof when moved from valve closed to valve open position and beingcountersunk in said slot in the valve closed position.

2. In a liquid discharge control valve for controlling the flow ofliquid, a liquid delivery tube, a capillary tube slidable therein andclosed at its inner end, said capillary tube having an opening abovesaid inner end, a head on said liquid delivery tube, packing in saidhead around said capillary tube, said `opening being selectivelypositionable either inside or outside said packing, said head having adepression and a slot through which the outer end of said capillary tubemoves to be protected by the sides of the slot when the valve is closedand to project into said depression for spraying purposes when the valveis open.

3. In a valve structure of the character disclosed, a head, and a valvefor controlling the discharge of liquid through said head comprising afirst tube, a second tube in which said rst tube is slidably mounted,the packing means at the `outer end of said second tube and surroundingsaid rst tube, said rst tube having an opening adapted to be selectivelypositioned outside or inside said packing means, said head having adepression, and a slot through which the discharge end of said rst tubemoves to be protected by the sides of the slot when the valve is closedand to project into said depression for spraying purposes when the valveis open.

ROBERT STEPHEN KNAPP.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS

